Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN CARGO EXTENDED, 5.7 R, L31/KL8REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 666 (CELLULAR COMMUNICATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESONSTAR REPROGRAMMINGVEHICLE COMMUNICATION UNIT (VCU)
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8
Vehicle Communication Unit (VCU)
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8SECTION Vehicle Communication Unit (VCU)
WARNING: This page is about a different car, the 2003 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
- Record the 11 digit Electronic Serial Number (ESN) number from the label on the new module.
- Install the new VCU.
- After replacement, press and hold the white "Dot" button until the OnStar status LED turns from green, to red, and then back to green.
- Install a scan tool. Use the I.D. Information menu to access the new ESN.
- Move the vehicle to an open area that is away from tall buildings, and with a clear view of unobstructed sky. Allow the vehicle to run for 10 minutes.
- Press the blue OnStar button to connect to the OnStar Call Center. Tell the advisor that this vehicle has received a new VCU and ask them to perform the following:
- Add the new ESN to update the customer's account.
- Activate the OnStar Personal Calling feature if it is available in the area.
- Perform a full reconfiguration on the vehicle.
- The OnStar® Advisor will reconfigure the vehicle with you. Once the advisor completes the reconfiguration, you can end the call. Follow any additional instructions given by the Advisor.
- The old VCU must be returned for core credit with the address label included in the original box. Failure to return core will result in a debit.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.